Laws Of Motion

• The Law of Conservation of Momentum states that the total momentum of a closed system of colliding bodies remains constant provided that no external forces are acting on it. Thus, it is always valid in a closed system.
• The change in total momentum of the system is zero, i.e., the initial momentum equals the final momentum. This adheres to the law of conservation.
• Although there is a change in momentum of individual bodies, the total system momentum remains unchanged.
• The change in total energy of the system can be zero if the collision is perfectly elastic, but inelastic collisions may result in energy transformation, albeit the total energy (including all forms) is conserved.

Given these principles, the incorrect statement is: Law of conservation of momentum is not valid, since the law always applies in a closed system.